fix: $state.eager() is sometimes incorrect in SSR (#18530)

Fix #18529

A simple fix : `context.visit()` was missing on the argument of
`$state.eager()`, so the generated code can be incorrect in some case :

.changeset/long-buttons-hunt.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: ensure `$state.eager()` is correctly transormed for SSR output

packages/svelte/src/compiler/phases/3-transform/server/visitors/CallExpression.js

@@ -46,7 +46,7 @@ export function CallExpression(node, context) {
 	}
 
 	if (rune === '$state.eager') {
-		return node.arguments[0];
+		return context.visit(node.arguments[0]);
 	}
 
 	if (rune === '$state.snapshot') {

packages/svelte/tests/server-side-rendering/samples/state-eager/_expected.html

@@ -0,0 +1,2 @@
+<div>value=0</div>
+<div>eager=0</div>

packages/svelte/tests/server-side-rendering/samples/state-eager/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	let props = $props();
+	const value = $derived(props.number ?? 0);
+</script>
+
+<div>value={value}</div>
+<div>eager={$state.eager(value)}</div>